ROI Calculator (Return on Investment, VND)
Return on Investment (ROI) answers the most basic question in any deal: for every dong I put in, how much did I get back? It is net profit divided by the capital you actually committed, expressed as a percentage. Because it is a single, intuitive number, ROI works across almost everything a foreigner in Vietnam might consider — a fund certificate, a stake in a local business, an apartment, or a professional course that lifts your earning power.
That simplicity hides a trap. The ROI everyone quotes is total (cumulative) ROI: it sums up the entire gain over the holding period and ignores how long you held. A "50% return" sounds great, but 50% over one year is nothing like 50% over five. To compare investments held for different lengths of time on a fair basis, you need annualized ROI — effectively a CAGR. In this calculator's larger example: put in 500.000.000 VND, add 20.000.000 VND of costs, exit at 800.000.000 VND after 4 years. Net profit is 280.000.000 VND, total ROI is 53.85%, but the annualized figure is only about 11.37%/year.
The figure foreigners most often miss is transaction cost. Vietnamese deals carry real frictions: brokerage commissions, the 2% personal income tax on real-estate transfers, notarization fees, fund management fees, and FX spread if you converted from another currency. Those are capital you committed but that never appear in the headline price. This tool has a separate "additional costs" input so your ROI reflects the money that actually left your account, not a flattering number on a brochure.
How the calculator computes ROI
The inputs
| Input | What it means |
|---|---|
| Initial investment | The amount paid to acquire the asset |
| Additional costs | Brokerage, transfer tax, notary, management or FX fees — extra committed capital |
| Final value | The amount you receive on exit or maturity |
| Years | The holding period |
Net profit and total ROI
Net profit = Final value − Initial investment − Additional costs
Total ROI = Net profit ÷ (Initial investment + Additional costs)
The denominator is your total committed capital, not just the purchase price — which is exactly why fees drag ROI down. Quick check on the large example: (800.000.000 − 500.000.000 − 20.000.000) ÷ 520.000.000 = 280.000.000 ÷ 520.000.000 = 53.85%.
Annualized ROI
Total ROI ignores time, so it cannot compare two deals held for different numbers of years. Annualizing fixes that with a compound-growth formula:
Annualized ROI = (Final value ÷ (Initial + Costs))^(1 ÷ years) − 1
For the same example: (800.000.000 ÷ 520.000.000)^(1/4) − 1 = 11.37%/year. This is a compound annual growth rate — mathematically the same idea as CAGR. FiMo has dedicated CAGR and compound-interest tools if you want to run the calculation the other way (given a rate, project a future value).
ROI versus CAGR versus compound interest
- Total ROI: a whole-period snapshot, one number, time-blind — best for reporting "how much did this deal make".
- Annualized ROI / CAGR: a per-year rate — best for comparing deals of different lengths.
- Compound interest: the inverse direction — given a rate and a horizon, project the ending balance.
What ROI does not capture
ROI says nothing about risk (a risky 50% is not the same as a safe 20%), ignores inflation (nominal ROI versus real ROI), and is easy to flatter by quietly omitting costs. Always enter the full cost figure and read the annualized number next to the total.
Worked example: 500.000.000 VND in, 800.000.000 VND out after 4 years
With 20.000.000 VND of costs, committed capital is 520.000.000 VND. Net profit = 800.000.000 − 500.000.000 − 20.000.000 = 280.000.000 VND. Total ROI = 280.000.000 ÷ 520.000.000 = 53.85%, which annualizes to 11.37%/year.
Why the holding period changes everything
Hold the same total return constant (total ROI 53.85%) and watch the per-year rate fall as the years stretch out:
| Holding period | Total ROI | Annualized ROI (CAGR) |
|---|---|---|
| 1 year | 53.85% | 53.85%/year |
| 4 years | 53.85% | 11.37%/year |
| 7 years | 53.85% | 6.35%/year |
A 53.85% gain banked in a single year is excellent; the same gain spread over seven years is only 6.35%/year — potentially worse than a term deposit. When a seller quotes a big total return, always ask over how many years, then look at the right-hand column.
The cost of ignoring costs
If you had run this same deal ignoring the 20.000.000 VND of fees, total ROI would have looked like 60.00% instead of the true 53.85%. That gap is entirely the friction of commissions, transfer tax and FX. Enter every cost so the calculator shows the return your bank balance actually experienced — then stress-test a longer holding period and a worse exit price before committing.
Frequently asked questions
What is ROI and how is it calculated?
ROI (return on investment) is net profit divided by total committed capital, shown as a percentage. The formula is ROI = (Final value − Initial investment − Costs) ÷ (Initial investment + Costs). Example: put in 500.000.000 VND with 20.000.000 VND of costs, exit at 800.000.000 VND → net profit 280.000.000 VND, ROI = 53.85%.
What is the difference between total ROI and annualized ROI?
Total ROI adds up the entire gain over the holding period and ignores its length. Annualized ROI converts that into a per-year compound rate, so you can compare deals held for different times. A total ROI of 53.85% equals 53.85%/year if earned in one year, but only 11.37%/year over 4 years and 6.35%/year over seven.
Is annualized ROI the same as CAGR?
Mathematically, yes. Annualized ROI = (Final value ÷ Committed capital)^(1/years) − 1, which is exactly the compound annual growth rate. The only practical difference is that ROI usually breaks out "additional costs" so they are not forgotten. If you want to go further, FiMo has dedicated CAGR and compound-interest tools that project a future value from a given rate.
Should I include fees and taxes in ROI?
Yes, if you want the real number. Brokerage, the 2% personal income tax on Vietnamese real-estate transfers, notary fees, fund management fees and FX spread are all committed capital. On the worked example, ignoring costs shows 60.00% ROI, but including the 20.000.000 VND of costs the true ROI is 53.85%. Omitting costs is the most common way investors overstate their returns.
What counts as a good ROI?
There is no fixed threshold — it depends on risk, inflation and your alternatives. A big-sounding total ROI can still be weak: 53.85% over seven years is just 6.35%/year, possibly below a term deposit. The rule of thumb: always read the annualized figure, compare it with the risk-free rate over the same period and with inflation, then judge.
Does ROI account for inflation?
No. The ROI this tool outputs is nominal. Your purchasing power grows at the real ROI, roughly nominal ROI minus inflation. An annualized 11.37%/year is a genuine gain when inflation is low, but the same figure may merely break even when inflation is high. Pair this calculator with FiMo's inflation tool to see the result in real terms.
What does a negative ROI mean?
A negative ROI means the final value is below your total committed capital — you lost money. For instance, committing 520.000.000 VND (500.000.000 plus 20.000.000 of costs) but exiting at only 500.000.000 VND produces a negative net profit and a negative ROI. The calculator still reports the figure, so you can see the size of the loss both in total and on a per-year basis.